Db-Cp - Uniden U2 Instruction Manual

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ADJUSTING MANUAL GAIN CONTROL:
The manual gain control (MGC) adjusts the overall amplification level (gain) of the
booster. The Manual Gain Control is used to resolve the issue of oscillation without
the need of readjusting your antennas, in most cases.
The MGC allows you to easily reduce the amount of gain (amplification) the
booster is emitting. This is done with a set of dip switches on the side of the
booster. There are a series of dip switches to adjust the uplink and another set to
adjust the downlink.
There are two sets of dip switches, one is labeled "1900MHz" and the other
labeled "850 MHz". Each set is divided between the downlink and the uplink. The
dip switches, when put into the "ON" position will reduce the gain of the booster
for the designated frequency and transmission direction. When the LED alarms
indicate oscillation (turns orange, red or off) you need to reduce the gain of the
downlink and the uplink for the appropriate frequency. Do this gradually in order to
determine the ideal level.
ADJUSTING THE UPLINK
Please follow these procedures for each frequency.
If the alarm LED turns off immediately after commissioning the system, the
signal on the uplink is likely too strong. Take measures to reduce the uplink gain.
Continue to increase the gain reduction until the alarm light changes to green.
ADJUSTING THE DOWNLINK
Once you have fine-tuned the uplink signal, it is time to adjust the downlink. If the
alarm LED is green you are all set. If the alarm LED is orange, you will only need to
reduce the gain slightly. If the alarm LED is red, you will need to greatly reduce the
gain. As you implement the gain reductions, the LED alarms should change from
Red or Orange to green.
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